01-Simple Factory

Description: Encapsulates a base class that inherits a base class and can be implemented by a factory class when a different object needs to be instantiated. Example: implemented by a calculator applet. The code is implemented as follows: Operation base class

    /// <summary>    ///Operation class/// </summary>     Public classoperaction {Private Double_numbera =0; Private Double_numberb =0;  Public DoubleNumbera {Get{return_numbera;} Set{_numbera =value;} }         Public DoubleNumberb {Get{return_numberb;} Set{_numberb =value;} }         Public Virtual DoubleGetResult () {Doubleresult =0; returnresult; }    }

Op Subclass, I put it in the OperactionAll.cs.

    /// <summary>    ///Plus/// </summary>    classoperactionadd:operaction {/// <summary>        ///Operation Method/// </summary>        /// <returns></returns>         Public Override DoubleGetResult () {Doubleresult =0; Result= Numbera +Numberb; returnresult; }    }    /// <summary>    ///minus/// </summary>    classoperactionsub:operaction { Public Override DoubleGetResult () {Doubleresult =0; Result= Numbera-Numberb; returnresult; }    }    /// <summary>    ///Multiply/// </summary>    classoperactionmul:operaction { Public Override DoubleGetResult () {Doubleresult =0; Result= Numbera *Numberb; returnresult; }    }    /// <summary>    ///except/// </summary>    classoperactiondiv:operaction { Public Override DoubleGetResult () {Doubleresult =0; Result= Numbera/Numberb; returnresult; }    }

Factory class

    /// <summary>    ///Factory class/// </summary>     Public classOperactionfactory {//methods for creating instances         Public StaticOperaction Createoperaction (stringoperacte) {operaction oper=NULL; Switch(operacte) { Case "+": Oper=NewOperactionadd ();  Break;  Case "-": Oper=Newoperactionsub ();  Break;  Case "*": Oper=NewOperactionmul ();  Break;  Case "/": Oper=NewOperactiondiv ();  Break; }            returnOper; }    }

Client Calls

    /// <summary>    ///Client Calls/// </summary>    classProgram {Static voidMain (string[] args) {operaction oper=NULL; Oper= Operactionfactory.createoperaction ("-");//creating entities from a factoryOper. Numbera =Ten; Oper. Numberb=5; Doubleresult = oper. GetResult ();//Operation MethodConsole.WriteLine (Result);        Console.ReadLine (); }    }

Finished. Code: Click to download

01-Simple Factory